MailwynxFeatures
Built for full-fidelity migrations.
Every feature in Mailwynx exists to answer one question an MSP asks on every project: will the calendar and contacts still be there when the client logs in on Monday?
Full fidelity
More than just the mail
Mailwynx treats a mailbox as more than a pile of email. It moves the calendar and contact detail users actually notice when it goes missing.
Mail & folder structure
Full message history — bodies and attachments — with the folder structure, flags and read/unread state preserved exactly as the user left them.
Calendars & recurrences
Meetings, recurring series, attendees, organizers, locations and reminders come across intact — no orphaned invites or duplicated events.
Personal contacts
Contacts migrate with their full fields — names, company, job title, every email and phone, addresses, birthday and notes — not just names and emails.
Both directions
Microsoft 365 → Google Workspace and Google Workspace → Microsoft 365. Mail, calendar and contacts move either way over the providers' native APIs.
IMAP & POP sources
Pull mail from legacy IMAP or POP servers into Microsoft 365 or Google Workspace. (IMAP/POP sources are mail-only — there's no calendar or contacts API to read.)
Dry-run preview
Run a no-write pass first: Mailwynx connects to both sides and reports exactly how many messages, events and contacts it would move — before anything is written.
Control
The operational bits that save your weekend
Delta sync & zero-downtime cutover
Pre-stage mailboxes over days, then run a final delta pass at cutover so users lose nothing that arrived mid-migration.
Batching & scheduling
Group mailboxes into waves and schedule them for off-hours. Throttling keeps you under the source API's rate limits automatically.
Automatic user mapping
Match source and destination accounts by address or UPN, with a clear review screen for the mismatches that always exist.
Completion reports
Per-mailbox item counts, warnings and a signed-off summary you can hand the client — proof the move landed clean.
Self-hosted & private
Runs in a container on your infrastructure. Credentials and message data never leave the environment you control.
Resumable & idempotent
Interrupted job? Re-run it. Mailwynx skips what already migrated instead of duplicating it, so retries are always safe.
See it move a real mailbox.
The fastest way to trust a migration tool is to watch it work. Book a 20-minute demo and bring your trickiest mailbox.